Stt-mram cell structures

a stt-mram cell and structure technology, applied in the field of magnetic random access memory, can solve the problems of high programming current density through the stt-mram cell, limited scalability of the mram cell, and prone to write disturbance, and affect the integrity and reliability of the cell

Active Publication Date: 2010-07-15
OVONYX MEMORY TECH LLC
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Though MRAM technology offers non-volatility and faster response times, the MRAM cell is limited in scalability and susceptible to write disturbances.
However, high programming current densities through the STT-MRAM cell may still be problematic.
High current densities through the magnetic layers may increase the energy consumption in the cell and the thermal profile in the layers, affecting the cell's integrity and reliability, and may also lead to larger silicon real estate consumption for each cell.

Method used

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Examples

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Embodiment Construction

[0020]As previously discussed, a spin torque transfer magnetic random access memory (STT-MRAM) cell is programmed by switching the magnetization of the free layer in the cell's magnetic cell stack. Switching occurs when the current density passing through the memory cell is larger than the critical switching current density. Thus, to program the cell, the programming current density need only be slightly higher than the critical switching current density. Since passing a larger programming current increases the energy consumption and the thermal profile in the cell stack, which affects the integrity and reliability of the cell, it is desirable to decrease the critical switching current without affecting the cell's thermal stability. Applying a lower programming current while maintaining a programming current density that is above the critical switching current density would allow a smaller current to switch the free layer of the cell. The following discussion describes the systems a...

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Abstract

A magnetic cell structure including a nonmagnetic bridge, and methods of fabricating the structure are provided. The magnetic cell structure includes a free layer, a pinned layer, and a nonmagnetic bridge electrically connecting the free layer and the pinned layer. The shape and/or configuration of the nonmagnetic bridge directs a programming current through the magnetic cell structure such that the cross sectional area of the programming current in the free layer of the structure is less than the cross section of the structure. The decrease in the cross sectional area of the programming current in the free layer enables a lower programming current to reach a critical switching current density in the free layer and switch the magnetization of the free layer, programming the magnetic cell.

Description

BACKGROUND[0001]1. Field of Invention[0002]The invention relates generally to magnetic random access memory, and more particularly, to Spin Torque Transfer Magnetic Random Access Memory (STT-MRAM).[0003]2. Description of Related Art[0004]This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present invention, which are described and / or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present invention. Accordingly, it should be understood that these statements are to be read in this light and not as admissions of prior art.[0005]Magnetic Random Access Memory (MRAM) is a non-volatile computer memory technology based on magnetoresistance. MRAM differs from volatile Random Access Memory (RAM) in several respects. Because MRAM is non-volatile, MRAM can maintain memory content when the memory devi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11C11/00H01L29/82
CPCH01L29/66007G11C11/16G11C11/1659G11C11/161G11C11/1675G11C11/15H10N50/10H10N50/01H10N50/85H10N50/80
Inventor LIU, JUNSANDHU, GURTEJ
Owner OVONYX MEMORY TECH LLC
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